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| Titel |
Inter-hemispheric asymmetry in the sea-ice response to volcanic forcing simulated by MPI-ESM (COSMOS-Mill) |
| VerfasserIn |
D. Zanchettin, O. Bothe, C. Timmreck, J. Bader, A. Beitsch, H.-F. Graf, D. Notz, J. H. Jungclaus |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2190-4979
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| Digitales Dokument |
URL |
| Erschienen |
In: Earth System Dynamics ; 5, no. 1 ; Nr. 5, no. 1 (2014-06-25), S.223-242 |
| Datensatznummer |
250115303
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| Publikation (Nr.) |
 copernicus.org/esd-5-223-2014.pdf |
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| Zusammenfassung |
| The decadal evolution of Arctic and Antarctic sea ice following strong
volcanic eruptions is investigated in four climate simulation ensembles
performed with the COSMOS-Mill version of the Max Planck Institute Earth System Model. The ensembles differ in the magnitude of the imposed volcanic
perturbations, with sizes representative of historical tropical eruptions
(1991 Pinatubo and 1815 Tambora) and of tropical and extra-tropical
"supervolcano" eruptions. A post-eruption Arctic sea-ice expansion is
robustly detected in all ensembles, while Antarctic sea ice responds only to
supervolcano eruptions, undergoing an initial short-lived expansion and
a subsequent prolonged contraction phase. Strong volcanic forcing therefore
emerges as a potential source of inter-hemispheric interannual-to-decadal
climate variability, although the inter-hemispheric signature is weak in the
case of eruptions comparable to historical eruptions. The post-eruption inter-hemispheric
decadal asymmetry in sea ice is interpreted as a consequence mainly of the different exposure of Arctic and Antarctic regional climates to induced
meridional heat transport changes and of dominating local feedbacks that set
in within the Antarctic region. Supervolcano experiments help to clarify
differences in simulated hemispheric internal dynamics related to imposed
negative net radiative imbalances, including the relative importance of the
thermal and dynamical components of the sea-ice response. Supervolcano experiments could therefore serve the assessment of climate models' behavior
under strong external forcing conditions and, consequently, favor
advancements in our understanding of simulated sea-ice dynamics. |
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